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" form of a right angle and alternately in op- UNI'TED 'STATES' PATENT'()11'I 315;.v

` HENRY iw. AVERY, or cLE'VELANnoHio, AssiGNoR To THE AVERY STAMP- yING'coMPANY, oE-sAME PLACE.

`SIZECIFIATION forming part of Letters PatentiNo. 413,841, dated October29, 1889.

Application filed January 2 8, 1889. Serial No. 297,864. (No model.)

T all wh/07% itnutyiaoncefn:

. Be it known that I, HENRYl W. AVERY, a

` citizen of the United States, residing at Cleveland, in the county ofCuyahoga and State of following is a full, clear, and Vexact descrip- 1tional View cfa modiiied and improved form l Ohio, have invented certainnew and useful Improvements in Pipe-Dampers, ofrwhich the tion,reference being had-to the'acco'mpanying drawings, in which- Figure 1 isaplan View of my improvedv dfamper.` Fig. 2 is a central verticalsectional View thereof. Fig. 3 is a central Vertical seeof my damper.A

My invention relates to that class of dampers which are most commonlyused in stove- The object of `my invention is to make an i i efficientand durable damper from sheet metal;

and te this endit consists in theconstruetion and combination of partsherein described,

4 and pointed out definitely in the claims.

Referring now to the drawings, A repre` of the rod. The shape into whichthese straps l tions d.. This renders it easy to bend the straps l arebent will of course conform to the shape of the damper-rod to be used.If a square rod be used, the straps will be bent in the positedirections, as shown.

In order to prevent the plate A from being warped out of shape by theaction of the'heat in the pipe, said plate isprovided'with the annularcorrugations d d. Thel straps B, which lie above the horizontal centralline of the damper, are bent fromV that part of the damper-plate whichis bent upward informing the corrugations CZ, and the lower straps B areformed in theV downwardly-bent corrugato the proper shape and in theproper direction without .bending vthe metal much more thanit is bent inthe act of corrugating it.

C represents a damper-rod adapted to be 'used with theabove-describeddamper-plate A. At one end of this rod a shoulder cisformed, care being taken not to make the Vcross-sectionalV area of therod at this shoulder so great as to prevent its passing between thestraps B B- to connect it to the damperplate. This shouldermay extendaround the rod,or it may be formed on the upper side of the rod only.The end of the rod beyond this shoulder, Where it is supported by thepipe, is reduced in size, as shown,whereby the shoulder c prevents therod from being pushed too far through the pipe. When the damperplate isplaced in the pipe, the rod is pushed through one side of the pipe, thenbetween the straps'B B', and then through the hole provided in the othersideof the pipe. In so doing the shoulder c passes beyond the straps,when the weight of the damper-plate causes it to settle down on thesmaller central part of said damper-rod. It will be foundthat anyaccidental withdrawal of the damper-rod is now impossible, because,unless precautions are taken to prevent such action, the shoulder cvvwill'strike against the strap B and prevent the removal of said rod.

It will be noticed that when' the parts are constructed as is herein'shown the shoulder c would cause a small space to be left around theplate and between it and the pipe. In order to till out this space, theannular flange a is turned over, substantially as shown,which causes thedamper-plate to iit the pipe, and also aids in preventing any warping ofthe plate A bythe heat.

In Fig. 3 the damper-plate is shown with its central portion madeconical and also corrugated. The conical shape adds strength to thedamper, both from its shape and because it also permits of a smallerhole in the center of the damper to get an equal amount of draft whenthe damper is closed, the inclined sides of the conical portiondirecting the current through the hole, instead of deflect-ing itbackward, as is the case with a fiat damper.

Among the advantages of the damper herein described over a cast-irondamper are that it is lighter, is not so easily broken, and is cheaper,because in making it small pieces of sheet metal (steel) which are leftafter other articles are made, and which has hitherto IOO only beenuseful to sell as serap, can be utilized.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A sheet-metal damper-plate A, having the annular corrugations d d andthe alternately-bent straps B B', the upper straps being bent from theupwardly-bent corrugations and the lower straps from the downwardlybentcorrugations, substantially as and for the purpose speciiied.

2. A sheet-metal damper-plate A, having the annular corrugations d d,the alternately-V bent straps B B', and the downwardly-bent annularilange a, combined with a damperrod C, having a shoulder c,substantially as and for the purpose specified.

3. A sheet-metal damper-plate having a substantially-horizontal rim withannular corrugations, a conical central part with an openingtherethrough, and the alternately-bent to engage with said shoulder c,substantially 3o as and for the purpose specified.

. HENRY W. AVERY. Witnesses:

E. L. THURs'roN, LEONARD WATSON.

